He rounded it to the nearest hundred, not ten. Ten would be 560.
Hope this helps!
X=5, because you would set the equations equal to each other, and then solve by additive inverse. Then, you find the square root by isolating x, from which you get 5.
Answer:
19440
Step-by-step explanation:
18000 x 0.08 = 1440
1440 + 18000 = 19440
Figure RST is congruent to figure R'S'T